tgr: it depends on what level your at, if just starting out you'll be able to get away with a small antler billet or about 3/4" copper bobber, and medium abrader for the rough out - later in the process it's good to have an ishi stick, but with glass you can prolly get away with a small pressure flaker - just a small length of broom handle with a copper nail inserted into the end.
there's all kinds of help online - video's, books, etc. It's best to find someone in your area that you can hook up with. Hope this helps.